Hand ported vortec heads

[Vilanus]

Hi,
I just finished porting/polishing a pair of vortec heads.Its the second set ive done. Machining aint done yet. Let me know what yall think.

 

[Vilanus]

Chambers opened a little bit around the intake valve, and sanded to 180grit

 

[Vilanus]

Intake done on 60grit, guide boss narrowed, blended everything

 

[Vilanus]

Intake runner top and bottom matched to gasket, roof raised to match, pushrod pinch opened a little and blended. 60grit again

 

[Supercharged111]

Before/after numbers?

 

[Vilanus]

HD Exhaust port with the dredded inconel valve seats. Once everything is ground, sanded and blended there just as good as the regular ones id say. Will need a 3 angle job... Bosses tapered and 180grit

 

[Vilanus]

Exhaust ports gasket matched minus the bottom.

 

[Vilanus]

Before/after numbers?

I dont have access to a flow bench so its anyone's guess. Hopefully worth 20+cfm

 

[1320John$$$]

They look good but for myself I have lost the desire to sit and grind on cast-iron for hours on end

 

[motorheadmike]

Exhaust ports gasket matched minus the bottom.

That looks like you touched the floor of the exhaust port. Which, if I remember correctly, is a big no-no. The Vortec heads benefited from an LT1-like intake port, but didn't get the D-port shape on the exhaust side to combat reversion. SSR is one thing, hogging them out is another.

This post shows an unmolested port floor:

Vortec 906 and 601 flow numbers ported and not/mild ported.

I got my 906 casting vortec head back from the machine shop. Same shop and same SF600 flow bench that flowed my 601 heads. Those are 305HO heads. The Vortec heads came off a 1996 chevy truck Virgin. I did not do any valve or seat grinding all I did was a bowl port and thin the guides and lap...

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